/**
* Copyright (c) 2002-2010 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.helpers.collection;
/**
* Iterates over a range, where the start value is inclusive, but the
* end value is exclusive.
*/
public class RangeIterator extends PrefetchingIterator<Integer>
{
private int current;
private final int end;
private final int stride;
public RangeIterator( int end )
{
this( 0, end );
}
public RangeIterator( int start, int end )
{
this( start, end, 1 );
}
public RangeIterator( int start, int end, int stride )
{
this.current = start;
this.end = end;
this.stride = stride;
}
@Override
protected Integer fetchNextOrNull()
{
try
{
return current < end ? current : null;
}
finally
{
current += stride;
}
}
}